1: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 2: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 3: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 4: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1.1: boron trifluoride diethyl etherate / dichloromethane / 2 h / 0 - 20 °C 2.1: sodium methylate / methanol / 20 °C 3.1: toluene-4-sulfonic acid / N,N-dimethyl-formamide / 20 °C 4.1: sodium hydride / N,N-dimethyl-formamide / 0.75 h / 0 °C 4.2: 3 h 5.1: trifluoroacetic acid / dichloromethane; water / 24 h / 20 °C 6.1: 2-aminoethyl diphenylborinate; N-ethyl-N,N-diisopropylamine / acetonitrile / 22 h / 20 °C 7.1: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / 1 h / 0 °C / |Reflux 8.1: ReOCl3(SMe2)(OPPh3) / benzene / 72 h / 0 °C 9.1: tetrabutyl ammonium fluoride / tetrahydrofuran 10.1: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 11.1: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 12.1: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 13.1: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 14.1: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: 2-aminoethyl diphenylborinate; N-ethyl-N,N-diisopropylamine / acetonitrile / 22 h / 20 °C 2: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / 1 h / 0 °C / |Reflux 3: ReOCl3(SMe2)(OPPh3) / benzene / 72 h / 0 °C 4: tetrabutyl ammonium fluoride / tetrahydrofuran 5: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 6: tetrabutyl ammonium fluoride / tetrahydrofuran / 5 h / 40 °C 7: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 8: 1H-imidazole / N,N-dimethyl-formamide / 0.75 h / 20 °C 9: triphenylphosphine hydrobromide / chloroform / 3.17 h / 20 °C / |Molecular sieve 10: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 4 h / 70 °C View Scheme

1: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / 1 h / 0 °C / |Reflux 2: ReOCl3(SMe2)(OPPh3) / benzene / 72 h / 0 °C 3: tetrabutyl ammonium fluoride / tetrahydrofuran 4: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 5: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 6: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 7: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 8: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: ReOCl3(SMe2)(OPPh3) / benzene / 72 h / 0 °C 2: tetrabutyl ammonium fluoride / tetrahydrofuran 3: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 4: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 5: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 6: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 7: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: tetrabutyl ammonium fluoride / tetrahydrofuran 2: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 3: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 4: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 5: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 6: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: ReOCl3(SMe2)(OPPh3) / benzene / 60 h / 0 °C 2: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 3: 1H-imidazole / N,N-dimethyl-formamide / 40 h / 20 - 50 °C 4: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 5: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: triphenylphosphine hydrobromide / chloroform / 3.17 h / 20 °C / |Molecular sieve 2: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 4 h / 70 °C View Scheme

1: triphenylphosphine hydrobromide / chloroform / 24 h / 20 °C / |Molecular sieve 2: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 144 h / 80 °C View Scheme

1: LiDBB / tetrahydrofuran / 0.25 h / -20 °C 2: 1H-imidazole / N,N-dimethyl-formamide / 0.75 h / 20 °C 3: triphenylphosphine hydrobromide / chloroform / 3.17 h / 20 °C / |Molecular sieve 4: ammonium fluoride-hydrogen fluoride / N,N-dimethyl-formamide; 1-methyl-pyrrolidin-2-one / 4 h / 70 °C View Scheme